Plate Tectonics

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Across 1. Theory that the lithosphere is made up of plates that float on the asthenosphere 5. Boundary formed by two lithospheric plates that are moving apart 6. Thin outer shell of the earth consisting of the crust and the ridge upper mantel 8. Material that makes up landmasses 13. Chain of volcanic islands formed along an ocean trench 16. Piece of land with a geologic history distinct from that of the surrounding land 17. Movement in a fluid caused by uneven heat 18. Undersea mountian range with a steep, narrow valley along its center 19. Region where one lithosphere plate moves under another 20. Transfer of heat through the movement of a fluid material

Down 2. Border formed by the direct collision of two lithospheric plates 3. Movement of the ocean floor away from either side of a mid-ocean ridge 4. Steep, narrow valley formed as lithospheric plates seperate 7. Deep valley in th ocean floor that forms along a subduction zone 9. Hypothesis stating that the continents once formed a single landmass 10. Material that makes up the ocean floor 11. System of undersea mountain ranges that wind around the earth 12. Giant ocean surrounding Pangaea 14. Single landmass thought to have been the origin of all continent 15. Zone of mantel beneath the lithosphere that consists of slowly flowing solid rock

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